JPH02277066A - Recording display device - Google Patents

Abstract

PURPOSE:To obtain a high contrast and to improve recording or displaying characteristic by providing a dielectric layer which is formed by incorporating a resin having at least >=5,000 number average mol. wt. and conductive fine particles on the surface of an image holding member. CONSTITUTION:A diffusion reflecting layer 2 and the dielectric layer 3 are laminated to one surface of a conductive base 1. The resin having at least >=5,000 number average mol. wt. and the conductive fine particles having 0.01 to 5mum particle size are incorporated into the dielectric layer 3, by which the dielectric layer can be formed without deteriorating the coating quality and the durability, such as wear resistance and flaw resistance are improved. An impressed voltage is eventually impressed more on the dielectric layer 3 than on the reflecting layer 2 if the electric resistance of the layer 2 is smaller than the electric resistance of the layer 3. The increase of the film thickness of the layer 2 is thus possible and the whiteness is improved. This effect is particularly remarkable when the volume resistivity of the layer 2 is <=10<12>OMEGA.cm. The contrast is thereby extremely increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus in which conductive colored fine powder is fixed by electric adsorption force, thereby recording and displaying.

[Conventional technology]

CRT display devices have traditionally been used as electrical display devices.

Liquid crystal display device 1 Light emitting diode display device, fluorescent display device, plasma display device, electrochromic display device
However, there are various problems such as the fact that displaying on a large screen requires advanced technology and is difficult, it is extremely expensive, the definition decreases, and the display flickers and causes severe visual fatigue. has shortcomings.

Therefore, several new display devices have been proposed to replace these display devices.

For example, a device that uses a photoconductive layer to electrically adsorb conductive colored magnetic fine powder at the same time as exposure (Japanese patent application No. 56)
-197410), a device that forms an electric latent image on a dielectric material using a pin electrode, etc., and displays it by electrically adsorbing insulating colored fine powder (Utility Model Application No. 57-55061).
Alternatively, a device that electrically adsorbs and displays conductive colored magnetic fine powder on a dielectric material using a pin electrode, etc. (Japanese Patent Publication No. 51-467
No. 07), a device that displays conductive colored magnetic fine powder using magnetic attraction force using an easily magnetizable stylus.

In principle, the above-mentioned devices are capable of high-precision display, can be displayed on a large screen easily and inexpensively, and because they are displayed using colored fine powder, the displayed image does not flicker and has excellent visual acuity. It has attracted attention due to its advantages such as relatively little fatigue.

However, on the other hand, it has not been put into practical use because it is insufficient in terms of high contrast, long life, stability under low environmental conditions, and high reliability required for display devices. Among them, a record display method as shown in FIG. 3 will be explained. A cylindrical magnet 9 is rotated within the non-magnetic cylinder 10, and the colored conductive magnetic fine powder 8 is conveyed on the non-magnetic cylinder 10 to be densely deposited on the non-magnetic cylinder 10 along the axial direction. It passes over the arrayed needle-like recording electrodes 11. Thus, a voltage is applied between the recording electrode 11 and the conductive layer 14 of the image holding member 12, which is composed of the recording layer 13 on the front side and the conductive layer 14 on the back side, and only the portion to which the voltage is applied is applied. An image is formed by attaching conductive colored magnetic fine powder to the image holding member 12.

A cleaning member may be provided to remove the displayed image on the image holding member, and blade cleaning, fur cleaning, suction cleaning, magnetic brush cleaning, brush cleaning, etc. used for removing fine powder may be provided. . As a cleaning method, it is more effective to electrically remove the charges induced on the image holding member through a cleaning member so as to remove the charges induced on the surface of the image holding member. Effective methods include arranging magnets adjacent to the surface and grounding them with conductive colored magnetic fine powder used for display interposed therebetween, or using a conductive brush.

In such a recording/displaying means, the following methods can be considered for increasing the contrast of the image holding member.

■A method of making the light reflecting surface uneven to cause diffused reflection.

■Method using aluminum anodic oxide film (Special Publication Publication No. 51
-Disclosed in Publication No. 46707).

(2) A method in which a diffuse reflection layer in which fine particles are dispersed in a binding resin is laminated on the conductive layer 7.

(2) A method of laminating on the conductive layer 7 a diffuse reflection layer in which fine particles are dispersed in a binding resin, and a dielectric layer.

However, method (2) is not preferable because the magnetic conductive developer is trapped in the recesses, resulting in a decrease in contrast.

In addition, in method (2), voltage leakage is likely to occur due to cracks occurring during anodization. Also, the surface becomes uneven.
This method causes the same disadvantages.

Furthermore, the whiteness of the anodic oxide film is low (contrast cannot be obtained sufficiently.Furthermore, there are various problems such as frequent voltage leaks when the environment changes, the density of recording or display decreases, and it is not possible to obtain sufficient contrast. comes out.

In the method (2), the initial whiteness is high and the contrast is excellent, but the magnetic conductive developer is trapped by the microscopic voids created by dispersing the fine particles during repeated use, resulting in a decrease in contrast.

Additionally, when the temperature, humidity, etc. fluctuate, moisture is adsorbed and desorbed in the microscopic voids that remain, and the electrical resistance increases (varies).As a result, the electrical adsorption force of the developer changes depending on the environment, causing the image to deteriorate. Problems such as large contrast fluctuations arise.In other words, under high humidity conditions, humidity adsorption progresses significantly through minute gaps, resulting in a significant decrease in electrical resistance and a decrease in the adsorption power of the magnetic conductive developer. This results in a decrease in contrast.

Method (2) is expected to have a high initial whiteness and basically excellent environmental stability, but the properties of the dielectric layer are insufficient and satisfactory display properties cannot be obtained.

The present invention has been made in order to solve the problems of the prior art described above, and its purpose is to record a display by electrically attracting conductive colored magnetic fine powder onto a dielectric material using a pin electrode or the like. It is an object of the present invention to provide a recording/displaying device that exhibits high contrast and excellent recording or displaying characteristics, has little environmental dependence, has excellent durability, and is highly stable.

[Means and effects for solving the problems] The present invention has the following features:
An image holding member and a plurality of divided electrodes are arranged so as to be separated and face each other through conductive colored magnetic fine powder, and the holding member applies a voltage between the image holding member and the electrodes to the surface of the image holding member. The recording/display device is characterized in that it has a dielectric layer containing at least a resin having a number average molecular fi of 5000 or more and conductive fine particles. That is, by forming the dielectric layer from a resin having a number average molecular fi of 5000 or more and conductive fine particles, the following effects can be obtained.

The film quality during film formation is generally always influenced by the substrate. In particular, as the film thickness becomes thinner, on the order of micrometers, the film quality becomes significantly influenced by the substrate. As a result, the conductive colored magnetic fine powder does not adhere.As a result, even if the contrast does not deteriorate, the display becomes rough due to lack of uniformity of density, and the display deteriorates.

In order to prevent film quality deterioration during thin film formation and to prevent the occurrence of pinholes, etc., it has been found that the molecular weight of the resin used for the dielectric layer, that is, the molecular weight of the polymer, is required to make it less susceptible to the effects of the substrate. It is effective to increase the In other words, the higher the molecular weight, the higher the viscosity, allowing the film to cover the substrate without being repelled by various defects on the substrate, resulting in improved uniformity of film quality and the occurrence of pinholes even in a thin film state. The display characteristics were improved accordingly. However, as the molecular weight was increased, the surface smoothness of the dielectric layer became too good, which resulted in the dielectric layer and the magnetically conductive developer coming into close contact with each other, which resulted in magnetic conductivity. The injection of charge from the developer into the dielectric layer increased, making ghosts and the like a little more likely to occur. In addition, as the durability increases, the magnetic conductive developer tends to seep into the dielectric layer (
Contrast decreased slightly with durability.

In order to prevent this, it was found that by creating micro-gaps between the dielectric layer and the magnetic conductive developer, it is possible to increase insulation, reduce charge injection, eliminate ghosts, and prevent the magnetic conductive developer from seeping in. .

However, when used frequently, as a result of frictional charging caused by friction between the dielectric layer and the magnetic conductive developer during repeated use, the magnetic conductive developer is adsorbed to the surface of the dielectric layer due to the triboelectric charge, resulting in a slight contrast. It was found that there is a tendency to decrease. It is effective to add conductive fine powder to the dielectric layer in order to prevent the generation of charges due to frictional electrification and also to produce the effect of creating microgaps between the dielectric layer and the magnetic conductive developer. I found out something.

In addition to the above, it is expected that the inclusion of fine particles in the dielectric layer would cause deterioration of the film quality, but when a high molecular weight resin was used, the dielectric layer could be formed without causing deterioration of the film quality. As a result, the result also contributed to the improvement of display characteristics.

The effect of increasing the molecular weight of the resin constituting the dielectric layer and containing conductive fine particles is that durability such as abrasion resistance and scratch resistance is improved.

From the above points, we experimentally confirmed the effects of the present invention due to the high molecular weight of the resin constituting the dielectric layer and the inclusion of conductive fine particles in this recording/display device.
It has been found that reliable effects can be obtained if the resin is composed of a resin having a number average molecular weight of at least 5000 or more. Specific resin compositions include, for example, a single polymer or a mixture of polymers with a number average molecular fi of 5,000 or more, or a curable resin with a low molecular weight (for example, a number average molecular weight of several tens to several thousand) and a polymer with a number average molecular weight of 5,000. Mixtures of the above polymers were effective.

The number average molecular weight used was that obtained by gel permeation chromatography. Regarding conductive fine particles, the particle diameter is at least 0.01 μm to 5 μm.
It was found that a sufficient effect can be obtained if the amount of fine particles is contained.

Note that the conductive particle diameter was measured using various general particle size distribution meters, optical microscopes, electron microscopes, and the like.

In such a state, the voltage applied during recording is distributed according to the electrical resistance of the diffuse reflection layer and the dielectric layer.

■ (Applied voltage) = V + (voltage of the diffuse reflection layer) +v2 (voltage of the dielectric layer) = iXrl (electrical resistance of the diffused reflection layer) +1Xr2 (electrical resistance of the dielectric layer) (i: current flowing through the image holding member) Therefore, if the electrical resistance of the diffuse reflection layer is smaller than the electrical resistance of the dielectric layer, more applied voltage will be applied to the dielectric layer than to the diffuse reflection layer. In particular, if the electrical resistance of the dielectric layer is one order of magnitude or more higher than that of the diffuse reflection layer, the applied voltage will be 90%.
% or more is applied to the dielectric layer, and it is possible to increase the thickness of the diffuse reflection layer, significantly improving the whiteness, and making it possible to achieve very high contrast. It has also been experimentally confirmed that this effect is especially remarkable when the intrinsic volume resistivity of the diffuse reflection layer is 1012 Ω・cm or less, and it is also useful for removing ghosts and preventing contrast deterioration during repeated use. A great effect was also obtained.

As described above, the recording/display function by adsorption of the magnetic conductive developer in the present invention is achieved by at least the dielectric layer 6 by the electric field.
Since this is due to the charge induced in b, at least the dielectric layer must be a layer that has sufficient electrical resistance and does not easily become conductive, or that it generates a substantial potential when charged and produces sufficient contrast. The condition is that it works.

Therefore, the state in which the image holding member 5 should function depends somewhat on the conditions of use, but if high contrast is aimed at as in the present invention, the state in which the image holding member 5 should function is 100 m after being charged.
Since it is necessary to maintain 50% or more of the initial charging voltage at sec or more, it is preferable that at least the specific volume resistivity of the dielectric layer 6b is set to 1012 Ω·cm or more. When aiming for higher contrast, it is desirable that at least the specific volume resistivity of the dielectric layer 6b is xolaΩ·cm or more. The electrical resistance of the diffuse reflection layer 6a is set to a smaller value than the electrical resistance of the dielectric layer 6b.

In the recording/display device of the present invention, the display characteristics are based on the characteristics of the electrical resistance of the diffuse reflection layer and the dielectric layer, and since the charge is mainly generated facing the dielectric layer, it is proportional to the amount of charge generated in the dielectric layer 6b, so the magnetic Although it is somewhat related to the degree of coloring of the conductive developer, in principle, if the voltage applied when forming the t1 display is the film thickness between the dielectric layers 6b, then in order to obtain sufficient contrast, It is desirable that the relationship of V>15 (V/μm) xt (μm) be satisfied. In order to obtain even higher contrast, it is desirable that V>20 (V/μm)Xt (μm). Considering matching with the drive circuit, it is relatively easy to output a voltage of about 100 V or less, so the practical thickness of the dielectric layer 6b is 7 μm or less, preferably 5 μm or less.

The resin forming the dielectric layer 6b has a number average molecular weight of 5.
000 or higher, such as polyester.

Acrylic resin, polyolefin, polyacetal.

Polyamide, polystyrene, halogen-containing resin.

Silicone resin, polyether, polycarbonate.

Thermoplastic resins such as vinyl acetate resin, cellulose resin, and their copolymers, phenolic resin, xylene resin9 Petroleum resin, urea resin, melanin resin, unsaturated polyester, alkyd resin, epoxy resin, silicone Examples include a mixture of one or more curable resins represented by single or copolymers such as resins and furan resins, and the aforementioned resins having a number average molecular fi of 5000 or more.

The conductive fine particles include conductive metal powder, conductive carbon, conductive metal oxide, and the like.

However, when conductive metal powder is made into powder, it is oxidized and forms an oxide film on the surface, which makes it difficult to use as a metal powder. Conductive carbon cannot be used because its whiteness is 0 and contrast cannot be obtained.

In the present invention, tin oxide, zinc oxide, and antimony oxide are used to impart a predetermined conductivity in terms of contrast for recording or display devices.

Indium oxides were excellent.

For example, fine particles of tin oxide, tin oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide,
Metal oxides such as barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or barium carbonate.

Conductive fine particles made of metal carbonate such as magnesium carbonate and calcium carbonate are desirable.

For example, fine particles of zinc oxide, zinc oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide,
Conductive fine particles made of metal oxides such as barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, or metal carbonates such as barium carbonate, magnesium carbonate, and calcium carbonate are desirable.

For example, fine particles of antimony oxide, antimony oxide and other metal oxides such as titanium oxide, magnesium oxide, silicon oxide, aluminum oxide, barium oxide, or barium sulfate, magnesium sulfate.

Metal sulfates such as calcium sulfate or barium carbonate,
Fine particles made of metal carbonate such as magnesium carbonate and calcium carbonate are desirable. For example, fine particles of indium oxide, indium oxide and other titanium oxides,
Magnesium oxide.

Conductive fine particles made of metal oxides such as silicon oxide, aluminum oxide, barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or metal carbonates such as barium carbonate, magnesium carbonate, calcium carbonate, etc. is desirable.

In addition to these conductive fine particles, for example, there are methods of forming a film by mixing incompatible polymers, and methods of dispersing insoluble fine particles in a binding resin. Insoluble fine particles include titanium oxide, aluminum oxide, and magnesium oxide.

Metal oxides such as calcium oxide and barium oxide.

Use a mixture of metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, metal carbonates such as barium carbonate, magnesium carbonate, and calcium carbonate, fine powder of thermoplastic resin, or hardened fine powder of curable resin. This had an excellent effect on increasing the contrast.

Note that the fine particles are not limited to these.

In addition to this, an ion conductive material is added to the dielectric layer.

It is also possible to lower the electrical resistance by adding an ion conductive polymer, an electronic conductive substance, an electronic conductive polymer, etc.

The diffusive reflective layer may be made of organic resin powder such as styrene resin powder, silicone resin powder, halogenated olefin resin powder (e.g. polyethylene powder, polytetrafluoroethylene powder), acrylic resin powder, phenolic resin powder, melamine resin powder, etc. Or titanium oxide, magnesium oxide.

Calcium oxide, barium oxide, zinc oxide, tin oxide,
Reflective fine particles such as metal oxides such as antimony oxide and indium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, and metal carbonates such as barium carbonate, magnesium carbonate, and calcium carbonate are used in polyester, acrylic resin, etc. , polyolefin, polyacetal, polyamide, polystyrene, halogen-containing resin,
Thermoplastic resins represented by silicone resins, polyethers, polycarbonates, vinyl acetate resins, fiber-linked resins, and copolymers thereof, phenolic resins, xylene resins, petroleum resins, and urea resins.

Melamine resin, unsaturated polyester, alkyd resin,
Simple substances such as curable resins represented by simple substances or copolymers such as epoxy resins, silicone resins, and furan resins,
Alternatively, it is dispersed in a mixed resin.

In particular, it is desirable to add an ion conductive substance, an ion conductive polymer, an electron conductive substance, an electron conductive polymer, etc. to reduce the electrical resistance of the diffuse reflection layer in order to increase the contrast. The diffusive reflective layer has excellent reflectivity and excellent dispersibility, and there is less variation in electrical resistance due to the environment.Also, by using mainly conductive fine particles to significantly reduce electrical resistance, it is extremely effective. can get.

Examples of the conductive fine particles include conductive metal powder, conductive carbon, and metal oxides.

However, it is difficult to use conductive metal powder when it is oxidized and forms an oxide film on its surface, resulting in loss of conductivity, poor reflectivity, and whiteness that does not reach the required whiteness of 60% or more. Alternatively, conductive carbon cannot be used because its whiteness is 0 and contrast cannot be obtained.

In the present invention, tin oxide, zinc oxide, antimony oxide, indium oxide, etc. are excellent in providing a predetermined conductivity in terms of contrast as a recording or display device.

For example, fine particles of tin oxide, tin oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide,
Metal oxides such as barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or barium carbonate.

Fine particles made of metal carbonate such as magnesium carbonate and calcium carbonate are desirable.

For example, fine particles of zinc oxide, zinc oxide and other titanium oxides, magnesium oxide, silicon oxide, aluminum oxide,
Fine particles made of metal oxides such as barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, or metal carbonates such as barium carbonate, magnesium carbonate, and calcium carbonate are preferable.

For example, fine particles of antimony oxide, antimony oxide and other metal oxides such as titanium oxide, magnesium oxide, silicon oxide, aluminum oxide, barium oxide, or barium sulfate, magnesium sulfate.

Metal sulfates such as calcium sulfate or barium carbonate,
Fine particles made of metal carbonate such as magnesium carbonate and calcium carbonate are desirable. For example, fine particles of indium oxide, indium oxide and other titanium oxides,
Magnesium oxide.

Fine particles made of metal oxides such as silicon oxide, aluminum oxide, barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, calcium sulfate, or metal carbonates such as barium carbonate, magnesium carbonate, calcium carbonate, etc. are desirable. .

In addition to these conductive fine particles, reflective fine particles can be prepared by, for example, forming a film by mixing incompatible polymers, or dispersing insoluble fine particles in a binding resin. Insoluble fine particles include metal oxides such as titanium oxide, aluminum oxide, magnesium oxide, calcium oxide, and barium oxide, metal sulfates such as barium sulfate, magnesium sulfate, and calcium sulfate, barium carbonate, magnesium carbonate, and calcium carbonate. The use of a mixture of metal carbonate, fine powder of thermoplastic resin, fine hardened powder of curable resin, etc. had an excellent effect in increasing the contrast.

Note that the fine particles are not limited to these.

In particular, reflective particles may be used, such as 6-nylon, 6-row nylon, 610-nylon, 8-nylon, 11-nylon, etc.
Nylon, 12-nylon, and their copolymerized nylons (6/66/610/12 quaternary copolymerized nylon,
6/66 In the diffuse reflection layer dispersed in polyamide or modified polyamide such as binary copolymerized nylon, etc.) or N-alkoxymethyl modified nylon alone or in a mixture, the dispersion of reflective fine particles is extremely excellent. Therefore, the unevenness on the surface of the diffuse reflection layer is reduced.

This prevents the conductive magnetic fine powder from entering the recesses during repeated use (there is less decrease in contrast due to durability, and therefore the durability life can be extended).

Furthermore, since the distribution and magnetism of the reflective fine particles and polyamide or modified polyamide are improved, electrical uniformity is improved and image quality without roughness can be obtained. Furthermore, the light reflection of the reflective fine particles becomes uniform, which is effective in improving whiteness.

Due to the chemical properties of polyamide or modified polyamide, a flexible three-dimensional structure is formed by hydrogen bonds between polymer molecules, so there are very few cracks or voids generated inside the diffuse reflection layer. If micro-gaps such as cracks and voids exist in the diffuse reflection layer, when the environment changes, the electrical resistance increases (varies) due to significant adsorption and desorption of moisture inside the micro-gaps, and the electrical resistance of the conductive colored magnetic fine powder increases. The electrical adsorption force will change depending on the environment.

That is, under high humidity conditions, adsorption of humidity progresses significantly through the microgaps, resulting in an increase in electrical resistance (decrease), a decrease in the adsorption force of the conductive magnetic fine powder, and a decrease in contrast.

Therefore, as recognized in the present invention, when the microgaps are reduced, there is little change in electrical resistance when the environment changes, and the adsorption force of the conductive colored magnetic fine powder is less fluctuated, resulting in stable image quality such as density. Furthermore, the permeation of the conductive colored magnetic fine powder into minute gaps is reduced, resulting in less decrease in contrast when repeatedly displayed, leading to improved durability.

In addition, the electrical properties of polyamide or modified polyamide, that is, the volume resistivity of the polymer is generally 1016Ω・c.
However, polyamide or modified polyamide has a low volume resistivity of IQ 11~'4 Ω・cm, so the applied voltage used for recording can be removed efficiently (because it is done uniformly, the previous layer is The image quality is improved because it is easily erased and the memory capacity is reduced.

In addition to the above-mentioned effects of the present invention obtained by the diffuse reflection layer in which reflective fine particles are dispersed in polyamide or modified polyamide, an even more noteworthy effect is that the minute gaps such as cracks and voids in the diffuse reflection layer are reduced, thereby reducing the moisture content. Aluminum due to penetrating moisture becomes very low after a long period of time.

It has excellent long-term characteristic stability without causing image quality deterioration such as a decrease in density or fogging due to an increase in electrical resistance due to corrosion of a corrosive conductive layer such as iron, tin, or zinc.

Composition ratio P/ of reflective fine particles (P) and binding resin (B)
When the B ratio is P/B > 4, it is basically impossible to suppress the generation of minute gaps, and when P/B < 0.5, the whiteness decreases and the display characteristics become insufficient. Therefore, 4≧P/B≧
0.5 is an appropriate range as a composition ratio.

Until now, with such recording and display methods, it has been difficult to obtain a display with excellent density uniformity, high contrast, and excellent display characteristics. It has now become possible to obtain a display with excellent display characteristics, high contrast, and excellent image quality.

There are several methods for defining diffuse reflectance, but in the present invention, from the viewpoint of simplicity and practicality, it is defined as whiteness based on the reflection density obtained with a Macbeth densitometer or a similar functional product, based on the following.

Whiteness = ((1,44-reflection density) / (1,44
+0.04)) X100 Whiteness 100: Reflection density <
0.04 (Almost everyone described it as pure white in the panel test) Whiteness 0: Reflection density ≧ 1.44 (Almost everyone described it as black in the panel test. Also, the contrast was perfect (a state where it could not be obtained.) Such whiteness Based on the definition, the contrast of recording or display can be defined as the difference between the whiteness of the image holding member and the whiteness of the recording or display area.Therefore, a decrease in the whiteness of the image holding member necessarily means that the contrast will decrease. As a result, it becomes insufficient for recording or displaying.

Further, research has revealed that the effects of the present invention are not impaired even if an intermediate layer is provided between the conductive layer and the diffuse reflection layer to increase adhesion in order to prevent separation between the conductive layer and the diffuse reflection layer.

Further, the conductive layer in the present invention is a layer having sufficiently low electrical resistance and easily being in a conductive state, in other words, a layer that functions so as not to generate a substantial potential when charged. Therefore, the state in which the conductive layer should function depends on the conditions of use (there are some factors), but when aiming for high contrast as in the present invention, the floating potential generated in the conductive layer will cause a decrease in contrast. , that is, 1/1 of the initial charging potential at 100 msec or less after charging.
If it is attenuated to 0 or less, it can be said that there is a sufficient conduction state, so the specific electrical resistance of the conductive layer is 1012 Ω·cm. If the aim is to display images at higher speeds, it is required that the charged potential attenuates to 1/10 or less of the initial charging potential within 1 m5 ec after charging (therefore, the specific electrical resistance of the conductive layer is 1OI0Ωcm
The following are desirable.

The materials that form the conductive layer are aluminum and iron.

Conductive metals such as gold, tin, and zinc, carbon, and tin oxide.

The above conductive substance is powdered and dispersed in a single or composite conductive inorganic compound such as indium oxide or antimony oxide, or in a continuous phase such as a polymer, which particularly enhances the contrast in recording or display. For this reason, it is desirable that the conductive layer has low light absorption and excellent light reflection.

Next, although the conductive colored fine powder is not a condition that limits the present invention, it is mainly composed of a binder, conductive powder, magnetic material, and, if necessary, various dyes and pigments as colorants. It is.

As the binder, the above-mentioned binding resin is used, and is generally used in an amount of 15 to 60% by weight.

Further, as the conductive powder, conductive carbon, fine powder of various conductive metals, fine powder of conductive oxides such as zinc oxide, tin oxide, indium oxide, antimony oxide, etc. are used, and generally 2 to 30% by weight. used.

In addition, as a magnetic material, 20 to 80% by weight of ferric oxide etc.
used.

Furthermore, dyes and pigments such as various phthalocyanines and malachite green are used as coloring agents as needed.
It is used in a range of 20% by weight.

Heat each component listed above to about 100 to 300°C, mix uniformly, cool, and grind into fine powder, or remove powder with unnecessary particle size by classification, etc., if necessary. By doing so, the desired conductive colored magnetic fine powder can be obtained.

This generally has an average particle size of about 5 to 20 μm, and has a specific electrical resistance in the range of 10''Ω・cm to 10′Ω・cm at an applied voltage of 1OOv or less in a conductive colored fine powder storage container. Ru.

On the other hand, to introduce the general process conditions for the recording/display device of the present invention, first, the rotating magnetic poles are composed of about 6 to 50 poles and have a rotation speed of about 500 to 2,000 Gauss.
00-7. It is used by rotating at about OOOrpm. As the non-magnetic cylinder, a single or composite molded product of non-magnetic metal such as aluminum or stainless steel, or plastic or various inorganic oxides is used, and this may be used in a rotating or non-rotating state. As a recording electrode, the electrode width is 0, 1 = l m m.

Voltage 10~1OO with electrode spacing 0, 1 = 1 mm
An applied voltage of v is used. The moving speed of the recording medium is 50
~700m/sec, distance to electrode 50~500μm
It is set to a certain degree.

The structure of a model of an image holding member according to the present invention is illustrated in FIGS. 1 and 2.

In other words, FIG. 1 shows a diffuse reflection layer 2 on one side of a conductive support l.
FIG. 2 shows a structure in which a diffuse reflection layer 6 and a dielectric layer 7 are laminated on one side of a support 4 with a conductive layer 5 interposed therebetween.

Example A recording/displaying device shown in FIG. 4 was manufactured.

Reference numeral 26 denotes an image holding member formed in the shape of an endless belt, which is composed of a conductive support, a diffuse reflection layer, and a resin dielectric layer as shown in FIG. Note that the image holding member 26 may be in the form of a belt that is not endless. The image holding member 26 is wound around a pair of rollers 17° 23 arranged vertically opposite to each other.
In the display section 25, it is movably supported on a plane by a back plate 22 and rollers 17 and 23, and is driven in the direction of the arrow during image formation.

At the lowest position of the circulation path of the image holding member 26, that is, at the position facing the roller 17, conductive colored magnetic fine powder 8 as a display substance is attached to the image holding member 26 according to display information to form a display. Means 27 for doing this is provided. Note that the conductive colored magnetic fine powder 8 is housed in a container 15.

The information obtained from the document reading device 21 based on the display forming means 27 is sent to the recording control section 19 via the storage device 20.
is applied to the recording electrode 11 as an electrical signal. Note that 24 is a transparent plate, 18 is a cleaning member, and 25 is a display section.

Example-1 Methoxymethyl modification 6 with methoxymethylation rate of 20 wt%
- When 100 parts by weight of nylon was dissolved in 500 parts by weight of methanol and 200 parts by weight of toluene, the average particle size was 0.3.
200 parts by weight of conductive titanium oxide fine particles on which tin oxide and antimony oxide have been deposited are added to μm titanium oxide, and dispersed using a bead mill dispersion machine to give a viscosity of 100 cps and an average particle size of 0.
．． A 3 μm paint was created.

Apply this paint using a reverse roll coater at a coating speed of 4 m.
/min, roll gap 90μm, apply aluminum to a 100μm thick polyester film by vapor deposition to a thickness of 600mm, dry at 140°C to obtain a film thickness of 30μm.
A diffuse reflection layer of m was provided.

Next, butyral resin (number average molecular weight 40XlO") 3
．． 5 parts by weight were dissolved in 60 parts by weight of methyl ethyl ketone and 35 parts by weight of cyclohexanone, and dispersed in a bead mill together with 1.5 parts by weight of conductive titanium oxide prepared by depositing tin oxide and antimony oxide on titanium oxide with an average particle size of 0.3 μm. The paint with a viscosity of 35 cps was applied using a reverse roll coater at a coating speed of 4 m/min and a gap of 20 μm, dried at 140° for 5 minutes, and the resin dielectric layer with a thickness of 1 μm was coated with the white color. An image bearing member was fabricated on the diffuse reflective layer of the film.

The image holding member manufactured in this manner was attached to a display device shown in FIG. 4, and its display function was examined.

Using the same procedure, butyral resins with different number average molecular weights were added as Examples and Comparative Examples.

In addition, different thicknesses of the diffuse reflection layer and dielectric layer, and different amounts of conductive titanium oxide in which tin oxide and antimony oxide were deposited on the titanium oxide of the dielectric layer were added as examples and comparative examples, respectively.

A comparative example was added in which non-conductive anatase titanium oxide with the same particle size was used instead of conductive titanium oxide in the dielectric layer.

Example 7 On the diffuse reflection layer used in Example 1, 3.5 parts by weight of polystyrene (number average molecular weight 40 x 10") was dissolved in 60 parts by weight of methyl ethyl ketone and 35 parts by weight of cyclohexanone to obtain an average particle size of 0. .Viscosity 25 cp dispersed in a bead mill disperser with 1.5 parts by weight of conductive titanium oxide with tin oxide and antimony oxide deposited on 3 μm titanium oxide.
s paint using a reverse roll coater at a coating speed of 4 m.
/min, with a gap of 20 μm, and applied at 140° for 5
After drying for a few minutes, a resin dielectric layer with a thickness of 1 μm was placed on the diffuse reflection layer of the white film to produce an image holding member.

The image holding member manufactured in this way was attached to the display device shown in FIG. 4 in the same manner as in Example-1, and the display function was examined.

Using the same procedure, butyral resins with different number average molecular weights were added as Examples and Comparative Examples.

In addition, different thicknesses of the diffuse reflection layer and dielectric layer, and different amounts of conductive titanium oxide in which tin oxide and antimony oxide were deposited on the titanium oxide of the dielectric layer were added as examples and comparative examples, respectively.

A comparative example was added in which non-conductive anatase titanium oxide with the same particle size was used instead of conductive titanium oxide in the dielectric layer.

Example-13 3.5 parts by weight of polymethyl methacrylate (number average molecular weight 40 x 10'), 60 parts by weight of methyl ethyl ketone, and 35 parts by weight of cyclohexanone were dissolved on the diffuse reflection layer used in Example-1, and the average particle size was Conductive titanium oxide 1 with tin oxide and antimony oxide deposited on 0.3 μm titanium oxide
．． A paint with a viscosity of 20 cps dispersed with 5 parts by weight using a bead mill disperser was applied using a reverse roll coater at a coating speed of 4 m for 7 minutes and a gap of 20 μm, and dried at 140° for 5 minutes to give a film thickness of 1 czm. An image holding member was manufactured by disposing a resin dielectric layer on the diffuse reflection layer of the white film.

The image holding member manufactured in this way was attached to the display device shown in FIG. 4 in the same manner as in Example-1, and the display function was examined.

Using the same procedure, butyral resins with different number average molecular weights were added as Examples and Comparative Examples.

In addition, different thicknesses of the diffuse reflection layer and dielectric layer, and different amounts of conductive titanium oxide in which tin oxide and antimony oxide were deposited on the titanium oxide of the dielectric layer were added as examples and comparative examples, respectively.

A comparative example was added in which non-conductive anatase titanium oxide with the same particle size was used instead of conductive titanium oxide in the dielectric layer.

Example 19 On the diffuse reflection layer used in Example 1, 3.5 parts by weight of butyral resin (number average molecule fi5×10'') was dissolved in 60 parts by weight of methyl ethyl ketone and 35 parts by weight of cyclohexanone, with an average particle size of 0. A paint with a viscosity of 5 cps was dispersed with 1.5 parts by weight of 3 μm tin oxide using a bead mill disperser, and a coating speed of 4 m for 7 minutes was applied using a reverse roll coater.
It was coated with a gap of 20 μm, dried at 140' for 5 minutes, and a resin dielectric layer with a thickness of 1 μm was placed on the diffuse reflection layer of the white film to produce an image holding member.

The image holding member manufactured in this way was attached to the display device shown in FIG. 4 in the same manner as in Example-1, and the display function was examined.

The paint used in Example 19 was used, the gap of the coater was changed, and the thickness of the dielectric layer was set to 5 μm. In addition, dielectric layers with a film thickness of 1 μm and 5 μm were prepared in the same manner as in Example 19 by using a small amount of tin oxide.

Further, the fine powder was changed from tin oxide to another substance and added as an example.

The above is summarized in Tables 7 and 8.

Example-31 Methoxymethylation 6- with a methoxymethylation rate of 20 wt%
When 100 parts by weight of nylon was dissolved in 500 parts by weight of methanol and 200 parts by weight of toluene, an average particle size of 0.3μ was obtained.
200 parts by weight of anatase-type titanium oxide fine particles of m were added and dispersed in a bead mill disperser to prepare a paint having a viscosity of 100 cps and an average particle size of 0.3 μm.

Apply this paint using a reverse roll coater at a coating speed of 4.
Coated on a polyester film with a thickness of 100 μm on which aluminum was vapor-deposited to a thickness of 600 μm under the condition of a roll gap of 90 μm for 7 minutes, and dried at 140° C.
A diffuse reflection layer with a thickness of 30 μm was provided.

Next, butyral resin (number average molecule fi5X10') 3
．． 5 parts by weight were dissolved in 60 parts by weight of methyl ethyl ketone and 35 parts by weight of cyclohexanone, and dispersed in a bead mill together with 1.5 parts by weight of conductive titanium oxide, which had tin oxide and antimony oxide deposited on titanium oxide with an average particle size of 0.3 μm. The paint with a viscosity of 5 cps was dispersed using a reverse roll coater at a coating speed of 4 m/min.

The coating was applied with a gap of 20 .mu.m, dried at 140" for 5 minutes, and a 1 .mu.m thick resin dielectric layer was placed on the diffuse reflection layer of the white film to produce an image holding member.

The image holding member manufactured in this manner was mounted in the apparatus shown in FIG. 4 in the same manner as in Example-1, and the display function was examined.

Another example was added in the same manner as in Example 31, using 6/66/610/12 quaternary copolymerized nylon instead of the methoxymethylated 6-nylon used in Example 31.

In addition, a comparative example was added to each of the examples in which anatase type titanium oxide having the same particle size and no conductivity was used instead of the conductive titanium oxide in the dielectric layer.

As is clear from the above embodiments, the present invention provides excellent contrast, recording or display characteristics, and repeatability.
Environmental stability can be obtained.

The present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the gist. For example, the recording and displaying device shown in FIG. 1 is provided with a writing display function, a reading function, and a printing function, and FIG. 5 shows another embodiment of the recording and displaying device according to the present invention.

Image information to be displayed is input from the document reading device 30 and sent as an electrical signal to the recording electrode 11 by the recording control unit 28 from the encoding/decoding circuit 31 via the encoding/decoding circuit 31 and the storage device 29 or directly. applied.

Further, on the outer peripheral side of the image holding member 45, a writing medium 44 formed in the shape of an endless belt, transparent, and capable of being written on and erased with a felt pen or the like is disposed, and this writing medium 44 is provided with rollers 48, 50, . 40 so that it can circulate and move, and is supported in a flat manner by rollers 40.degree. 48 in the display section. Further, in the vicinity of the roller 17, a cleaning member 5 is provided for removing the conductive colored magnetic fine particles adhering to the image on the image holding member 45 and the back surface of the writing medium 44.
1.52 is provided. This cleaning member removes conductive colored magnetic fine powder by moving toner spikes formed on the outer periphery of a cylindrical member by magnetic attraction in a rotating brush shape. Furthermore, an erasing member 49 for erasing an image written on the writing medium 44 is disposed below the roller 19. Furthermore, the image holding member 4
An image holding member 45 and a means 38 for reading the image on the writing medium 44 are arranged on the back side of the writing medium 5 . That is,
At the reading position that is the closest position between the recording medium 5 and the writing medium 44, there is a lamp 39 with a reflective shade 37 that illuminates the images on both members 45 and 44, and a lens that captures the reflected light image from both members 45 and 44. A mirror 36 is provided to allow the light to enter the photoelectric conversion element 33 via the mirror 34 . The images of both members 45 and 44 are read by the photoelectric conversion element 33 and recorded on the printer 32 directly via the encoding/decoding circuit 31 or via the storage device 14.

〔Effect of the invention〕

According to the present invention, it is possible to provide a recording/display device exhibiting high contrast and excellent recording or display characteristics.

[Brief explanation of drawings]

FIGS. 1 and 2 are layer configuration diagrams of one embodiment of the image holding member for recording and display of the present invention, respectively. FIG. 3 is an explanatory diagram of the principle of recording using conductive colored magnetic fine powder. FIG. 4 and FIG. 5 are explanatory diagrams of one aspect of the recording/displaying apparatus according to the present invention, respectively. l... Conductive support 2... Diffuse reflection layer 3...
Resin dielectric layer 4... Support 5... Conductive layer
6... Diffuse reflection layer 7... Resin dielectric layer 8.
...Conductive colored magnetic fine powder 11...Recording electrode
15... Container 16... Device framework 17 and 23... Roll 22... Back plate 24...
Transparent plate 26...image holding member Fig. 2

Claims (2)

[Claims] (1) An image holding member and a plurality of divided electrodes are arranged so as to face each other in isolation via conductive colored magnetic fine powder, and a voltage is applied between the image holding member and the electrodes to form the image holding member. A recording and display device in which electrically conductive colored magnetic fine powder is attached to a surface of the image holding member, characterized in that the surface of the image holding member has a dielectric layer containing at least a resin having a number average molecular weight of 5000 or more and conductive fine particles. recording display device. (2) The specific volume resistivity of the image holding member is 10^1^2Ω・
The recording/displaying device according to claim 1, wherein the recording/displaying device has a width of cm or more.